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what is diffusion
the net movement of substances from an area of high concentration to an area of low concentration down a concentration gradient directly through the phospholipid bilayer
4 facts about diffusion
molecules have kinetic energy
no energy required from atp
no specific proteins required
molecules that diffuse through the bilayer
lipid soluble
small non polar
very small and polar
4 factors affecting the rate of diffusion
temperature high temp more kinetic energy
concentration gradient
thickness of exchange surface the shorter the quicker
the surface area the larger the quicker